Trysquares



July 7, 1970 A UENQT 3,518,768

'I'RYSQUARES Original Filed Sept. 12 1967 2 Sheeis-$heet 1 FIG. FIG. 2

I II II FIG. 4

A. QUENOT TRYSQUARES July 7, 1970 2 Sheets-Sheet Original Filed Sept.12, 1967 FIG. //b

FIG. l/a

United States Patent 45 Int. Cl. B431 7/00 US. Cl. 33112 12 ClaimsABSTRACT OF THE DISCLOSURE A trysquare having a stock and a blade. Thestock comprises a drawn metallic section having a cross sectional shapeforming opposite channels with the blade disposed at one end of thestock at an angle thereto. Two inserts are received respectively in thechannels and have end portions embracing a portion of the blade receivedbetween them. The inserts are secured in the channels and are secured tothe blade.

This application is a continuation of application Ser. No. 667,177,filed Sept. 12, 1967, now abandoned.

The manufacture of trysquare in current use for example of metallictrysquares used in work yards poses a certain number of problems.

In effect, the two elements of the angle plate which form a right anglemust be well united one to the other in order that there can be no playand that the right angle be maintained.

On the other hand, the two elements of the trysquares must be easy toassemble in order not to be too expensive.

Many solutions have already been proposed, unfortunately some of thesesolutions do not result in trysquares of a quality having goodcharacteristics of rigidity and precision, and the others require aworking of the branches which is too expensive.

Thus-there exist trysquares formed of a scale blade fixed in the millingof a moulded piece by keys or pegs located in bosses of the piece. It isevident that such trysquares have an excessive price due to themachining of almost all the surfaces of the corner plate stud.

Consequently the invention proposes toprovide a simply mounted andconstructed trysquares made from currently available material and whichis at once solid and accurate. a

To this effect, the invention is concerned with metallic trysquarescharacterized by the two elements, one of which is a blade and the otheris a tubular, or non-tubular, drawn section or stock united by securingmeans comprising made of synthetic material or moulded metal.

The invention will be better understood by referring to the followingdescription made by way of non-limiting example and to the accompanyingdrawing in which:

FIG. 1 is an elevation view of a trysquare constituted by a blade heldin the milling of an I-shaped drawn section.

FIG. 2 is a side view of the trysquare according to FIG. 1.

FIG. 3 is an elevation view of a trysquare secured by two elements ofsynthetic material or moulded metal.

FIG. 4 is a side view of the trysquare according to FIG. 3.

FIG. 5 is a cross-sectional view taken along line VV of the trysquareaccording to FIG. 3.

FIG. 6 is a cross section view illustrating the securing of the blade.

3,518,768 Patented July 7, 1970 'ice FIG. 7 is a cross section viewillustrating another way of securing the blade.

FIG. 8 is an elevation view of a trysquare with a tubular drawn section.

FIG. 9 is a cross-section view taken along line IXIX of FIG. 8 for thetrysquare with drawn section.

FIG. 10 shows a trysquare with a mitre joint and a tubular drawnsection.

FIGS. 11a and 11b are views illustrating a trysquare formed of two drawnsections in the shape of a U, shown from the side in FIG. 11b and fromabove in FIG. 11a.

Trysquare 1 is constituted by the rectangular assembly of a blade 2 andof a stock constituted by drawn profile 3 in the form of an I. The blade2 can be graduated or not. The drawn section 3 is provided with a slot 4milled along its medial plane. Securing elements 5, which can forexample be pins or rivets, maintain blade 2 in slot 4.

An edge 6 of the blade 2 can overlap by a given distance an extremity 7of the drawn section 3. Similarly, a lower end 8 of the blade 2 islocated at a level above that of a lower base on edge 9 of the drawnsection 3.

On the other hand, the rear extremity 7 of the drawn section 3 can makean angle of 30-45 or 60 relative to the base 9, or any other anglepermitting the tracing of angles.

The utilization of the I-shaped drawn section from the stock permits animportant saving by eliminating the need for moulding and the machiningwhich follows it.

In effect, industry produces actually drawn sections the geometricqualities of which and whose surface are sufficiently precise to avoidall additional machining for a trysquare of average precision.

REFERRING TO FIGS. 3, 4 AND 5 The trysquare 6 comprises in the samemanner as angle plate 1 a blade 11 graduated or not and an I-sha edsection 12.

Two elements 13 or 14 for example parallelepipedal in shape madepreferably of a synthetic material or moulded metal are fastened oneither side of a core 15 of the drawn section 12 by means of securingelements for example screws 16 or pins, connecting through said core 15,by means of to punch holes, elements 13 and 14 together.

Rear extremities 17 and 18 of these elements 13 and 14 overlap anextremity 19 of the drawn section 12 in order to receive a base of theblade 11. The blade 11 is maintained between the two elements 13 and 14by fastening elements 21, for example, pegs or rivets.

The link between blade 11 and drawn section 12 is thus obtained by thesynthetic material or moulded metal pieces 13 and 14. This type offastening requires no milling of the drawn section for the passage ofthe blade. It permits, moreover, the use of drawn sections the core ofwhich is thinner than that of section 12 of FIG. 2, due to theelimination of this milling. Core 15 and blade 11 can be of differentthicknesses. In this case the difference in thickness will becompensated by shoulders in the moulded pieces 13 and 14.

The molded pieces 13 and 14 are knurled to facilitate the grippingcontribute to the improvement of the aesthetic appearance of thetrysquare assembly.

The rear extremities 17 and 18 of these elements 13 and 14 are notnecessarily perpendicular to the lower edge 31 of the drawn section 12and can form with this edge an angle of 3045 or 60 or any other angle,

REFERENCE IS MADE TO FIG. 6

In order to obtain a facile and precise mounting of the blade 11 betweentwo elements 13 and 14, various solutions can be employed.

Thus element 13 can comprise cylindrical or non cylindrical studs 22which engage in a corresponding opening REFERENCE 1s MADE TO FIG j In amodification: of the fastening .of.the blade.

.tweenelements. 13 and 14, element. 1'3 .is, provided one or severalprojectionsQSQyvhichpass through" 1 corresponding holes in blade, 14,.penetratingin on several openings 27 of. the element14.

Elements .13 and 14 additionallyh vetholes28 and I infront of which aredisposed fastening. ample pins (notshown). t I .i

Naturally, in the preceding examples, ,I bemounted indifferent ways. Itcan be located section 12 as shown in FIG. 3. Itca n also peiie or lessdeeply in section 12,,because a slot is cut therein and milled in amanner similar. ,to the otherfslot 4 A lower extremity 30 of blade 11canbe'on the levell iof the lower edge 31 or shifted relative thereto. I

.. The accuracy of fabrication ,of the drawn sections can be used tosecure theretO one or several air bubble in order to make a combinationinstrument;

REFERENCE IS MADE TO FIGS. 8 AND 9 Trysquare 32 is illustrated in FIGS.8 and 9 consisting of a blade 33 and a tubular drawn stock 34 preferablyof rectangular cross-section. This stock 34 can comprise on its uppersurface 35 a slot 36 through which passes a blade 33. I

It is evident that slot 36 can be of any length as long as it allows therear edge of blade 33 to overlap. The slot 36 can also be omitted andblade 33 can be located completely out of the drawn section 34.

The blade 33 is maintained between two elements 37 and 38 of mouldedsynthetic material or of injected metal, by means of cogs 39 and pins40, which may be fluted and which pass through the tubular section 34,elements 37 and 38 and the blade 33. Naturally, any other assembly canbe used.

' The blade 33 can comprise at its lower portion a stop 41 which bears'on the rear face of a base 42 of section The elements 37 and 38 whichcan overlap an edge 44 of the blade to a greater or lesser extent bypenetrating deeper in the tubular section, can also be secured insidethe drawn section 34 by securing elements 43, such as screws or by beingmade as a force fit in the'section.

In this last case pins cannot go through section 34 in order to passthrough only the elements 37 and 38 of the blade 35. In this casetubular section 34 may nothave a slot and may stop perpendicular to theinner edge 44 of blade 33.

REFERENCE IS MADE TO FIG.- 10

The trysquare 45 made from a blade 46 and a tubular drawn section 47whose ends are ,cut ofi to form a right angle. The rear extremity 48 ofthe drawn section 47 is inclined relative to the main portion thereof.

A blade 46 is gripped between two elements,'49, for example an elementof synthetic moulded material or injected metal. Securing elements 51,for example pins, maintain the blade 46 and two elements securedtogether.

These two elements can be replaced by a single moulded piece (not shown)provided with a median slot for the passage of the blade 46.

The drawn section 47 comprises in its upper rear part a short slot 52.It may also be without a slot and in this case the inner edge of theblade 46 passes by extremity 53 of the upper surface of the drawnsection .or the blade 46 is nicked in order to allow the penetration ofedge 53 of the drawn section.

Similarly the lower extremity of the blade..46.can be placed level withthe lowersurface 54 of drawn section 47. In this case the surface 54comprises a.sl ot (not shown) or the blade is unhookable at itsextremity.

l 'S MADEl' b' aa 11' sis. qnnm, .b'y. ub draw isea .p asqp askl p' ba'Afi .58 W thesetwo drawn sectionsby'means of '5 '..f x mpt pi s Q i et:Ihere is insertedfbetween sections 56 and 57 a core; 60, ,f or'; example of synthetic gmaterial or I moulded metal,preferablyfhayingthe samethickness as the blade astening elements "6 1 secure the, two sectionsan to the other. Naturally itis possiblefto inal re other types oftrysquare from two U-shaped sectionsIby using or not using syntheticmaterial elements similar to elements 13 .5114 1.. IQ]. L. f j V 1 'TlieQtrysquare can c ornprise various improvements, for Iexample, or ieor. severalgraduated air bubble level containers (not shown) or a linearmeasuring tape 62. In this'case the overall length of the trysquare inwhich the tape is. housed is advantageously a number easy to add to thewithdrawn part of the tape.

What I claim and desire to secure by letters patent is:

1. A trysquare comprising a stock and a blade, s aid stock comprisingadrawn metallic section having a cross sectional shape forming. oppositechannels, said, blade being disposed at-one end of said stock at anangle thereto, twouinserts received respectively in said channels andhaving end porti ons embracing aportion of saidblade received between.thermmeans securing said inserts in said channels of said drawn metallicsection, ,and means securing saidend portions of said insertsto .saidportion of said-blade I 2.,A trysquare accordingto claim 1, in whichsaid inserts are of molded synthetic material.

, -3. A trysquareaccording ,to claim 1, inserts are of molded metal.

4. A trysquare according to claim 1, in which said drawn-metallicsection is I-shaped in cross section with .a central plane web portionand opposite flange portions defining between them, said channels onopposite .sides of..said web portion, said. blade being disposed in theplane ofsaid web portion. I I I v 5. A trysquare according to. claim 1,in which at least one integral stud on one said insert passes. through ahole in said blade-and is received in an alignedhole in :the other ofsaid inserts. I

, 6.; A try square. according to-claim 1,. in which .said drawnmetallicsection. is. of rectangular tubular cross section,withoppositeflside walls, a top wall and a base .definingsaid pppositechannels in which said inserts are i r ni. 5.1. 1--

A'trysquare accordingto claim 16, in whichlsa id'top wall is formedatone end with a slcotin, which said blade wdr I j. i I, a A 8. Atrysquare according tov claim,6, innwhicli a tape measure is,disposedinside anlend portion of 'said'rectan-gular metallic section,opposite thef end at which said blade isd i sposed., e, a 9i A;.. .trysquar,e according to claim ,6, in which the ends of said side walls ofsaid rectangular metallic section; adjacent said blade aredisposed at anangle of forty ,five degrees. to the l ength ofsaid metallic section.

10. A trysquare comprisinga stock and ablade, said stoclccornprising a.drawn rnetallic section offI-shaped cross section with a central webportion and opposite flange. portions defining between them channels onopposite sides of saidweb po rtion said blade being disposed at oneendof said .stocle at an angle thereto, and two inserts received in saidchannels and having end portions embracing a portion of said bladereceived between them, neans securing said inserts to said drawnI-shaped secin which said tion, and means securing said end portions ofsaid inserts to said portion of said blade.

11. A trysquare comprising a stock and a blade, said stock comprising adrawn metallic section of rectangular tubular cross section with upperand lower walls and opposite side walls, said blade being disposed atone end of said stock at an angle thereto, and two inserts received insaid tubular stock and having end portions embracing a portion of saidblade received between them, means securing said inserts in said stock,and means securing said end portions of said inserts to said portion ofsaid blade.

12. A trysquare according to claim 11, wherein said inserts are shorterthan said tubular metallic section so as to leave a hollow portion atthe end of said tubular disposed, and in which a linear measuringinstrument with a tape is disposed in said hollow, said tape beingextensible in line with said stock.

References Cited UNITED STATES PATENTS 126,527 5/1872 Disston et al.1,323,742 12/ 1919 Burroughs. 2,246,260 6/ 1941 McGrath 33-112 FOREIGNPATENTS 655,691 12/1928 France. 496,696 7/1954 Italy.

metallic section opposite the end at which the blade is 15 HARRY N.HAROIAN, Primary Examiner

